41. Which of the following best summarizes the main idea of the passage?
(A) Smaller grocery stores have completely replaced major supermarket chains by offering consumers environmentally friendly alternatives.
(B) The environmental problems caused by supermarkets can only be solved if governments introduce stricter regulations on food waste and plastic packaging.
(C) Although major supermarkets have begun responding to criticisms of food and plastic waste, more comprehensive efforts are still needed, and smaller retailers provide useful models for sustainable practices.
(D) Most supermarkets have already achieved their environmental goals by eliminating plastic packaging and greatly reducing food waste.